2 * Copyright (C) 2013 Stefan Sauer <ensonic@users.sf.net>
4 * gstrusage.c: tracing module that logs resource usage stats
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
23 * @short_description: log resource usage stats
25 * A tracing module that take rusage() snapshots and logs them.
33 #include "gstrusage.h"
35 #ifdef HAVE_SYS_RESOURCE_H
37 # define __USE_GNU /* RUSAGE_THREAD */
39 #include <sys/resource.h>
42 GST_DEBUG_CATEGORY_STATIC (gst_rusage_debug);
43 #define GST_CAT_DEFAULT gst_rusage_debug
45 G_LOCK_DEFINE (_proc);
48 GST_DEBUG_CATEGORY_INIT (gst_rusage_debug, "rusage", 0, "rusage tracer");
49 #define gst_rusage_tracer_parent_class parent_class
50 G_DEFINE_TYPE_WITH_CODE (GstRUsageTracer, gst_rusage_tracer, GST_TYPE_TRACER,
53 /* remember x measurements per self->window */
54 #define WINDOW_SUBDIV 100
56 /* number of cpus to scale cpu-usage in threads */
57 static glong num_cpus = 1;
61 /* time spend in this thread */
63 GstTraceValues *tvs_thread;
69 free_trace_value (gpointer data)
71 g_slice_free (GstTraceValue, data);
74 static GstTraceValues *
75 make_trace_values (GstClockTime window)
77 GstTraceValues *self = g_slice_new0 (GstTraceValues);
78 self->window = window;
79 g_queue_init (&self->values);
84 free_trace_values (GstTraceValues * self)
86 g_queue_free_full (&self->values, free_trace_value);
87 g_slice_free (GstTraceValues, self);
91 update_trace_value (GstTraceValues * self, GstClockTime nts,
92 GstClockTime nval, GstClockTime * dts, GstClockTime * dval)
96 GstClockTime window = self->window;
97 GQueue *q = &self->values;
98 GList *node = q->tail;
102 /* search from the tail of the queue for a good GstTraceValue */
105 dt = GST_CLOCK_DIFF (lv->ts, nts);
109 node = g_list_previous (node);
114 /* calculate the windowed value */
116 *dval = GST_CLOCK_DIFF (lv->val, nval);
118 /* drop all older measurements */
119 while (q->tail != node) {
120 free_trace_value (g_queue_pop_tail (q));
128 /* don't push too many data items */
129 lv = q->head ? q->head->data : NULL;
130 if (!lv || (GST_CLOCK_DIFF (lv->ts, nts) > (window / WINDOW_SUBDIV))) {
131 /* push the new measurement */
132 lv = g_slice_new0 (GstTraceValue);
135 g_queue_push_head (q, lv);
142 free_thread_stats (gpointer data)
144 free_trace_values (((GstThreadStats *) data)->tvs_thread);
145 g_slice_free (GstThreadStats, data);
149 do_stats (GstTracer * obj, guint64 ts)
151 GstRUsageTracer *self = GST_RUSAGE_TRACER_CAST (obj);
152 GstThreadStats *stats;
153 gpointer thread_id = g_thread_self ();
154 guint avg_cpuload, cur_cpuload;
156 GstClockTime tproc = G_GUINT64_CONSTANT (0);
157 GstClockTime tthread = G_GUINT64_CONSTANT (0);
158 GstClockTime dts, dtproc;
160 #ifdef HAVE_CLOCK_GETTIME
164 if (!clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &now)) {
165 tproc = GST_TIMESPEC_TO_TIME (now);
167 GST_WARNING_OBJECT (obj,
168 "clock_gettime (CLOCK_PROCESS_CPUTIME_ID,...) failed: %s",
170 getrusage (RUSAGE_SELF, &ru);
172 GST_TIMEVAL_TO_TIME (ru.ru_utime) + GST_TIMEVAL_TO_TIME (ru.ru_stime);
175 /* cpu time per thread */
176 if (!clock_gettime (CLOCK_THREAD_CPUTIME_ID, &now)) {
177 tthread = GST_TIMESPEC_TO_TIME (now);
179 GST_WARNING_OBJECT (obj,
180 "clock_gettime (CLOCK_THREAD_CPUTIME_ID,...) failed: %s",
182 getrusage (RUSAGE_THREAD, &ru);
184 GST_TIMEVAL_TO_TIME (ru.ru_utime) + GST_TIMEVAL_TO_TIME (ru.ru_stime);
188 getrusage (RUSAGE_SELF, &ru);
189 tproc = GST_TIMEVAL_TO_TIME (ru.ru_utime) + GST_TIMEVAL_TO_TIME (ru.ru_stime);
190 getrusage (RUSAGE_THREAD, &ru);
192 GST_TIMEVAL_TO_TIME (ru.ru_utime) + GST_TIMEVAL_TO_TIME (ru.ru_stime);
194 /* get stats record for current thread */
195 if (!(stats = g_hash_table_lookup (self->threads, thread_id))) {
196 stats = g_slice_new0 (GstThreadStats);
197 stats->tvs_thread = make_trace_values (GST_SECOND);
198 g_hash_table_insert (self->threads, thread_id, stats);
200 stats->tthread = tthread;
202 /* Calibrate ts for the process and main thread. For tthread[main] and tproc
203 * the time is larger than ts, as our base-ts is taken after the process has
206 if (G_UNLIKELY (thread_id == self->main_thread_id)) {
207 self->main_thread_id = NULL;
208 /* when the registry gets updated, the tproc is less than the debug time ? */
209 /* TODO(ensonic): we still see cases where tproc overtakes ts, especially
210 * when with sync=false, can this be due to multiple cores in use? */
212 self->tproc_base = tproc - ts;
213 GST_DEBUG ("rusage: calibrating by %" G_GUINT64_FORMAT ", thread: %"
214 G_GUINT64_FORMAT ", proc: %" G_GUINT64_FORMAT,
215 self->tproc_base, stats->tthread, tproc);
216 stats->tthread -= self->tproc_base;
219 /* we always need to correct proc time */
220 tproc -= self->tproc_base;
222 /* FIXME: how can we take cpu-frequency scaling into account?
223 * - looking at /sys/devices/system/cpu/cpu0/cpufreq/
224 * scale_factor=scaling_max_freq/scaling_cur_freq
225 * - as a workaround we can switch it via /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
226 * cpufreq-selector -g performance
227 * cpufreq-selector -g ondemand
230 avg_cpuload = (guint) gst_util_uint64_scale (stats->tthread,
231 G_GINT64_CONSTANT (1000), ts);
232 update_trace_value (stats->tvs_thread, ts, stats->tthread, &dts, &dtproc);
233 cur_cpuload = (guint) gst_util_uint64_scale (dtproc,
234 G_GINT64_CONSTANT (1000), dts);
235 gst_tracer_log_trace (gst_structure_new ("thread-rusage",
236 "ts", G_TYPE_UINT64, ts,
237 "thread-id", G_TYPE_UINT, GPOINTER_TO_UINT (thread_id),
238 "average-cpuload", G_TYPE_UINT, MIN (avg_cpuload, 1000),
239 "current-cpuload", G_TYPE_UINT, MIN (cur_cpuload, 1000),
240 "time", G_TYPE_UINT64, stats->tthread,
243 avg_cpuload = (guint) gst_util_uint64_scale (tproc / num_cpus,
244 G_GINT64_CONSTANT (1000), ts);
246 update_trace_value (self->tvs_proc, ts, tproc, &dts, &dtproc);
248 cur_cpuload = (guint) gst_util_uint64_scale (dtproc / num_cpus,
249 G_GINT64_CONSTANT (1000), dts);
250 gst_tracer_log_trace (gst_structure_new ("proc-rusage",
251 "ts", G_TYPE_UINT64, ts,
252 "average-cpuload", G_TYPE_UINT, MIN (avg_cpuload, 1000),
253 "current-cpuload", G_TYPE_UINT, MIN (cur_cpuload, 1000),
254 "time", G_TYPE_UINT64, tproc,
262 gst_rusage_tracer_finalize (GObject * obj)
264 GstRUsageTracer *self = GST_RUSAGE_TRACER (obj);
266 g_hash_table_destroy (self->threads);
267 free_trace_values (self->tvs_proc);
269 G_OBJECT_CLASS (parent_class)->finalize (obj);
273 gst_rusage_tracer_class_init (GstRUsageTracerClass * klass)
275 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
277 gobject_class->finalize = gst_rusage_tracer_finalize;
279 if ((num_cpus = sysconf (_SC_NPROCESSORS_ONLN)) == -1) {
280 GST_WARNING ("failed to get number of cpus online");
281 if ((num_cpus = sysconf (_SC_NPROCESSORS_CONF)) == -1) {
282 GST_WARNING ("failed to get number of cpus, assuming 1");
286 GST_DEBUG ("rusage: num_cpus=%ld", num_cpus);
288 /* announce trace formats */
290 gst_tracer_log_trace (gst_structure_new ("thread-rusage.class",
291 "thread-id", GST_TYPE_STRUCTURE, gst_structure_new ("scope",
292 "related-to", G_TYPE_STRING, "thread", /* TODO: use genum */
294 "average-cpuload", GST_TYPE_STRUCTURE, gst_structure_new ("value",
295 "type", G_TYPE_GTYPE, G_TYPE_UINT,
296 "description", G_TYPE_STRING, "average cpu usage per thread in ‰",
297 "flags", G_TYPE_STRING, "aggregated", /* TODO: use gflags */
298 "min", G_TYPE_UINT, 0,
299 "max", G_TYPE_UINT, 1000,
301 "current-cpuload", GST_TYPE_STRUCTURE, gst_structure_new ("value",
302 "type", G_TYPE_GTYPE, G_TYPE_UINT,
303 "description", G_TYPE_STRING, "current cpu usage per thread in ‰",
304 "flags", G_TYPE_STRING, "windowed", /* TODO: use gflags */
305 "min", G_TYPE_UINT, 0,
306 "max", G_TYPE_UINT, 1000,
308 "time", GST_TYPE_STRUCTURE, gst_structure_new ("value",
309 "type", G_TYPE_GTYPE, G_TYPE_UINT64,
310 "description", G_TYPE_STRING, "time spent in thread in ns",
311 "flags", G_TYPE_STRING, "aggregated", /* TODO: use gflags */
312 "min", G_TYPE_UINT64, G_GUINT64_CONSTANT (0),
313 "max", G_TYPE_UINT64, G_MAXUINT64,
316 gst_tracer_log_trace (gst_structure_new ("proc-rusage.class",
317 "thread-id", GST_TYPE_STRUCTURE, gst_structure_new ("scope",
318 "related-to", G_TYPE_STRING, "process", /* TODO: use genum */
320 "average-cpuload", GST_TYPE_STRUCTURE, gst_structure_new ("value",
321 "type", G_TYPE_GTYPE, G_TYPE_UINT,
322 "description", G_TYPE_STRING, "average cpu usage per process in ‰",
323 "flags", G_TYPE_STRING, "aggregated", /* TODO: use gflags */
324 "min", G_TYPE_UINT, 0,
325 "max", G_TYPE_UINT, 1000,
327 "current-cpuload", GST_TYPE_STRUCTURE, gst_structure_new ("value",
328 "type", G_TYPE_GTYPE, G_TYPE_UINT,
329 "description", G_TYPE_STRING, "current cpu usage per process in ‰",
330 "flags", G_TYPE_STRING, "windowed", /* TODO: use gflags */
331 "min", G_TYPE_UINT, 0,
332 "max", G_TYPE_UINT, 1000,
334 "time", GST_TYPE_STRUCTURE, gst_structure_new ("value",
335 "type", G_TYPE_GTYPE, G_TYPE_UINT64,
336 "description", G_TYPE_STRING, "time spent in process in ns",
337 "flags", G_TYPE_STRING, "aggregated", /* TODO: use gflags */
338 "min", G_TYPE_UINT64, G_GUINT64_CONSTANT (0),
339 "max", G_TYPE_UINT64, G_MAXUINT64,
346 gst_rusage_tracer_init (GstRUsageTracer * self)
348 GstTracer *tracer = GST_TRACER (self);
350 gst_tracer_register_hook_id (tracer, 0, G_CALLBACK (do_stats));
352 self->threads = g_hash_table_new_full (NULL, NULL, NULL, free_thread_stats);
353 self->tvs_proc = make_trace_values (GST_SECOND);
354 self->main_thread_id = g_thread_self ();
356 GST_DEBUG ("rusage: main thread=%p", self->main_thread_id);